CLAS Physics Database

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Measurement E151M64

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Experiment: EG4, 2016

Spokespersons: Xiaochao Zheng

Experiment comment: Final asymmetry results for the ep-> e pi+ (n) channel extracted from CLAS/EG4 data obtained using a longitudinally polarized beam and a longitudinally polarized NH3 target (CAA HS07-02).

No publications available for this experiment

Quantity measured: A_UL,
Target spin asymmetry.
Beam: e, polarization: longitudinal
Target: p (Z=1, A=1), polarization: longitudinal
Final state: π⁺n, polarization: none

Q² :	0.0101 GeV²
W :	1295 GeV
ε :	0.8705
E_beam :	1.0539 GeV
ε_L:	0.0476

Select data slice:
cos(θ_π⁺) =

Observable quantity measured (Y axis): A_UL,
Plot measurement data

Parameter (X axis): φ(π⁺), degrees

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Measured data:

cos(θ_π⁺)	φ(π⁺), degrees	A_UL	Data errors	Systematic errors
0.35	42	1.1816	0.7959	0.1377
0.35	54	0.0845	0.5644	0.0315
0.45	54	0.91	0.827	0.1078
0.55	42	-0.2347	0.6381	0.0402
0.55	222	0.0452	0.6747	0.0304
0.55	234	0.0088	0.5134	0.03
0.55	246	-0.2231	0.4557	0.0393
0.55	258	0.7244	0.517	0.0877
0.55	270	-0.2852	0.5482	0.0442
0.65	138	0.9398	0.6781	0.111
0.65	150	0.6847	0.7258	0.0835
0.65	162	0.5754	0.7002	0.072
0.65	174	0.1543	0.6512	0.0348
0.65	186	-0.5488	0.6521	0.0693
0.65	222	-0.7045	0.4514	0.0856
0.65	234	-0.304	0.3633	0.0458
0.65	246	-0.196	0.3397	0.0374
0.65	258	-0.3596	0.3653	0.0507
0.65	270	0.2458	0.5761	0.041
0.75	138	0.0112	0.7375	0.03
0.75	150	-0.9311	0.4816	0.1101
0.75	162	0.6478	0.5693	0.0796
0.75	174	0.3005	0.5961	0.0455
0.75	198	0.3237	0.7263	0.0475
0.75	222	0.2843	0.5659	0.0441
0.75	234	0.6198	0.3973	0.0766
0.75	246	-0.2552	0.3241	0.0417
0.75	258	-0.0448	0.413	0.0304
0.75	270	-0.2401	0.5916	0.0406
0.85	222	0.312	0.5007	0.0465
0.85	234	0.0606	0.4872	0.0308
0.85	246	0.5314	0.4227	0.0675
0.85	258	-0.178	0.4354	0.0362